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Joining 2 dissimilar metals such as iron and brass causes corrosion due to weak electric currents flowing in between the 2 metals. This process, called galvanic corrosion, gradually erodes the galvanized stole pipe without harming the brass faucet. One of two people galvanized iron or brass can contain lead, and corrosion deserve to leach the lead in either component right into the drinking water. Galvanized steel pipe can corrode for various other reasons also if suitable to compatible steel fittings such together aluminum.

You are watching: Chemical reaction between brass and galvanized steel


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metal corrodes with a combination of chemical and electrical reactions. Stole in the wall surfaces of a galvanized stole pipe combines chemically with liquified oxygen in the water the pipeline carries. Electrical differences between different locations of the steel pipe reason iron ions to relocate out of the metal, developing pits. Once two steels with an extremely different rates of organic corrosion touch, the metals exchange electrons. Steel ions circulation out that the anode, or positively charged steel in the pair, resulting in corrosion. Metals with an extremely different ranks in the galvanic series, a measurement of propensity to corrode, generate more powerful galvanic corrosion as soon as joined.

Compatible Metals

Joining two metals with similar rates of corrosion slowly galvanic reactions and also neither steel corrodes significantly. Installation an aluminum fixture come a galvanized iron pipe reasons no problems, due to the fact that aluminum and iron rank nearly the exact same on the galvanic scale. Installation brass come nickel likewise reduces galvanic action. Iron corrodes much much more easily 보다 brass, however, so joining these 2 metals accelerates the rusting that the iron. The more active steel in the galvanic pair becomes the anode and also dissolves away. Installation a brass faucet come a galvanized iron pipe always causes the slow devastation of the pipe.

Lead Dangers

Manufacturers the galvanized stole pipe raised the corrosion resistance the the pipe by electroplating the iron v zinc alloy. Zinc ranking much greater on the galvanic scale than iron, and through galvanization the iron repurchase a protective coating of zinc ions. Lead and also cadmium were common contaminants in zinc alloys offered in electroplating steel pipes, according to the Alabama cooperative Extension. Galvanized pipes deserve to release both of these poisonous steels as tube corrode. Brass fittings also release lead into drinking water through corrosion. Although modern-day brass fittings contain much less lead, alloys labeled "lead-free" deserve to still save 8 percent lead.

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Old galvanized pipe clogs with rust and also scale will eventually need replacement. Copper tubing, brass pipeline or plastic pipe safely replaces stole pipe, and special fittings can match brass faucets come plastic pipes. Involvement a brass faucet come compatible copper tubing or brass pipe additionally prevents galvanic corrosion. Any metal pipes and also fittings transporting corrosive, oxygen-rich water constantly release metal ions as surfaces dissolve. Running the water till the temperature drops remarkable empties pipe of stand water and also reduces threats of eating dangerous metals, follow to the Mesa, Arizona, city website. Usage water native the cold side of the mechanism for drinking and cooking.


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James Young began writing in 1969 as a military journalist combat correspondent in Vietnam. Young's short articles have been released in "Tai Chi Magazine," "Seattle Post-Intelligencer," Sonar 4 ezine, "Stars & Stripes" and also "Fine Woodworking." the has functioned as a foundryman, woodturner, electronics technician, herb farmer and woodcarver. Young i graduated from phibìc Seattle community College through an associate level in applied science and also electronic technology.